3 * Copyright (c) 2001 Fabrice Bellard
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 #include "libavutil/cpu.h"
32 #include "mpegvideo.h"
34 #include "h263_parser.h"
35 #include "mpeg4video_parser.h"
37 #include "vdpau_internal.h"
40 #include "mpeg4video.h"
43 //#define PRINT_FRAME_TIME
45 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
47 MpegEncContext *s = avctx->priv_data;
50 s->out_format = FMT_H263;
52 s->width = avctx->coded_width;
53 s->height = avctx->coded_height;
54 s->workaround_bugs= avctx->workaround_bugs;
57 MPV_decode_defaults(s);
59 s->decode_mb= ff_h263_decode_mb;
61 avctx->pix_fmt= avctx->get_format(avctx, avctx->codec->pix_fmts);
62 s->unrestricted_mv= 1;
64 /* select sub codec */
65 switch(avctx->codec->id) {
67 s->unrestricted_mv= 0;
68 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
72 case CODEC_ID_MSMPEG4V1:
77 case CODEC_ID_MSMPEG4V2:
82 case CODEC_ID_MSMPEG4V3:
101 s->msmpeg4_version=6;
102 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
112 s->codec_id= avctx->codec->id;
113 avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
115 /* for h263, we allocate the images after having read the header */
116 if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
117 if (MPV_common_init(s) < 0)
120 h263_decode_init_vlc(s);
125 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
127 MpegEncContext *s = avctx->priv_data;
134 * returns the number of bytes consumed for building the current frame
136 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
137 int pos= (get_bits_count(&s->gb)+7)>>3;
139 if(s->divx_packed || s->avctx->hwaccel){
140 //we would have to scan through the whole buf to handle the weird reordering ...
142 }else if(s->flags&CODEC_FLAG_TRUNCATED){
143 pos -= s->parse_context.last_index;
144 if(pos<0) pos=0; // padding is not really read so this might be -1
147 if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
148 if(pos+10>buf_size) pos=buf_size; // oops ;)
154 static int decode_slice(MpegEncContext *s){
155 const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
156 const int mb_size= 16>>s->avctx->lowres;
157 s->last_resync_gb= s->gb;
158 s->first_slice_line= 1;
160 s->resync_mb_x= s->mb_x;
161 s->resync_mb_y= s->mb_y;
163 ff_set_qscale(s, s->qscale);
165 if (s->avctx->hwaccel) {
166 const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
167 const uint8_t *end = ff_h263_find_resync_marker(start + 1, s->gb.buffer_end);
168 skip_bits_long(&s->gb, 8*(end - start));
169 return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
172 if(s->partitioned_frame){
173 const int qscale= s->qscale;
175 if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
176 if(ff_mpeg4_decode_partitions(s) < 0)
180 /* restore variables which were modified */
181 s->first_slice_line=1;
182 s->mb_x= s->resync_mb_x;
183 s->mb_y= s->resync_mb_y;
184 ff_set_qscale(s, qscale);
187 for(; s->mb_y < s->mb_height; s->mb_y++) {
188 /* per-row end of slice checks */
189 if(s->msmpeg4_version){
190 if(s->resync_mb_y + s->slice_height == s->mb_y){
191 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
197 if(s->msmpeg4_version==1){
203 ff_init_block_index(s);
204 for(; s->mb_x < s->mb_width; s->mb_x++) {
207 ff_update_block_index(s);
209 if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
210 s->first_slice_line=0;
215 s->mv_dir = MV_DIR_FORWARD;
216 s->mv_type = MV_TYPE_16X16;
217 // s->mb_skipped = 0;
218 //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
219 ret= s->decode_mb(s, s->block);
221 if (s->pict_type!=FF_B_TYPE)
222 ff_h263_update_motion_val(s);
225 const int xy= s->mb_x + s->mb_y*s->mb_stride;
227 MPV_decode_mb(s, s->block);
229 ff_h263_loop_filter(s);
231 //printf("%d %d %d %06X\n", s->mb_x, s->mb_y, s->gb.size*8 - get_bits_count(&s->gb), show_bits(&s->gb, 24));
232 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
234 s->padding_bug_score--;
236 if(++s->mb_x >= s->mb_width){
238 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
239 MPV_report_decode_progress(s);
243 }else if(ret==SLICE_NOEND){
244 av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
245 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x+1, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
248 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
249 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_ERROR|DC_ERROR|MV_ERROR)&part_mask);
254 MPV_decode_mb(s, s->block);
256 ff_h263_loop_filter(s);
259 ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
260 MPV_report_decode_progress(s);
265 assert(s->mb_x==0 && s->mb_y==s->mb_height);
267 if(s->codec_id==CODEC_ID_MPEG4
268 && (s->workaround_bugs&FF_BUG_AUTODETECT)
269 && get_bits_left(&s->gb) >= 48
270 && show_bits(&s->gb, 24)==0x4010
271 && !s->data_partitioning)
272 s->padding_bug_score+=32;
274 /* try to detect the padding bug */
275 if( s->codec_id==CODEC_ID_MPEG4
276 && (s->workaround_bugs&FF_BUG_AUTODETECT)
277 && get_bits_left(&s->gb) >=0
278 && get_bits_left(&s->gb) < 48
279 // && !s->resync_marker
280 && !s->data_partitioning){
282 const int bits_count= get_bits_count(&s->gb);
283 const int bits_left = s->gb.size_in_bits - bits_count;
286 s->padding_bug_score+=16;
287 } else if(bits_left != 1){
288 int v= show_bits(&s->gb, 8);
289 v|= 0x7F >> (7-(bits_count&7));
291 if(v==0x7F && bits_left<=8)
292 s->padding_bug_score--;
293 else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
294 s->padding_bug_score+= 4;
296 s->padding_bug_score++;
300 if(s->workaround_bugs&FF_BUG_AUTODETECT){
301 if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/)
302 s->workaround_bugs |= FF_BUG_NO_PADDING;
304 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
307 // handle formats which don't have unique end markers
308 if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
309 int left= get_bits_left(&s->gb);
312 /* no markers in M$ crap */
313 if(s->msmpeg4_version && s->pict_type==FF_I_TYPE)
316 /* buggy padding but the frame should still end approximately at the bitstream end */
317 if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_recognition>=3)
319 else if((s->workaround_bugs&FF_BUG_NO_PADDING))
320 max_extra+= 256*256*256*64;
323 av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
326 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
328 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
333 av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
334 get_bits_left(&s->gb),
335 show_bits(&s->gb, 24), s->padding_bug_score);
337 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
342 int ff_h263_decode_frame(AVCodecContext *avctx,
343 void *data, int *data_size,
346 const uint8_t *buf = avpkt->data;
347 int buf_size = avpkt->size;
348 MpegEncContext *s = avctx->priv_data;
350 AVFrame *pict = data;
352 #ifdef PRINT_FRAME_TIME
353 uint64_t time= rdtsc();
355 s->flags= avctx->flags;
356 s->flags2= avctx->flags2;
358 /* no supplementary picture */
360 /* special case for last picture */
361 if (s->low_delay==0 && s->next_picture_ptr) {
362 *pict= *(AVFrame*)s->next_picture_ptr;
363 s->next_picture_ptr= NULL;
365 *data_size = sizeof(AVFrame);
371 if(s->flags&CODEC_FLAG_TRUNCATED){
374 if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
375 next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
376 }else if(CONFIG_H263_DECODER && s->codec_id==CODEC_ID_H263){
377 next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
379 av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
383 if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
389 if(s->divx_packed && s->xvid_build>=0 && s->bitstream_buffer_size){
391 for(i=0; i<buf_size-3; i++){
392 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1){
394 av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
395 s->bitstream_buffer_size=0;
402 if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
403 init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
405 init_get_bits(&s->gb, buf, buf_size*8);
406 s->bitstream_buffer_size=0;
408 if (!s->context_initialized) {
409 if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
413 /* We need to set current_picture_ptr before reading the header,
414 * otherwise we cannot store anyting in there */
415 if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
416 int i= ff_find_unused_picture(s, 0);
417 s->current_picture_ptr= &s->picture[i];
421 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
422 ret= ff_wmv2_decode_picture_header(s);
423 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
424 ret = msmpeg4_decode_picture_header(s);
425 } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
426 if(s->avctx->extradata_size && s->picture_number==0){
429 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
430 ret = ff_mpeg4_decode_picture_header(s, &gb);
432 ret = ff_mpeg4_decode_picture_header(s, &s->gb);
433 } else if (CONFIG_H263I_DECODER && s->codec_id == CODEC_ID_H263I) {
434 ret = ff_intel_h263_decode_picture_header(s);
435 } else if (CONFIG_FLV_DECODER && s->h263_flv) {
436 ret = ff_flv_decode_picture_header(s);
438 ret = h263_decode_picture_header(s);
441 if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
443 /* skip if the header was thrashed */
445 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
449 avctx->has_b_frames= !s->low_delay;
451 if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
452 if(s->stream_codec_tag == AV_RL32("XVID") ||
453 s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
454 s->codec_tag == AV_RL32("RMP4") ||
455 s->codec_tag == AV_RL32("SIPP")
459 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
460 && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
465 if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
466 if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
467 s->divx_version= 400; //divx 4
470 if(s->xvid_build>=0 && s->divx_version>=0){
475 if(s->workaround_bugs&FF_BUG_AUTODETECT){
476 if(s->codec_tag == AV_RL32("XVIX"))
477 s->workaround_bugs|= FF_BUG_XVID_ILACE;
479 if(s->codec_tag == AV_RL32("UMP4")){
480 s->workaround_bugs|= FF_BUG_UMP4;
483 if(s->divx_version>=500 && s->divx_build<1814){
484 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
487 if(s->divx_version>502 && s->divx_build<1814){
488 s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
491 if(s->xvid_build<=3U)
492 s->padding_bug_score= 256*256*256*64;
494 if(s->xvid_build<=1U)
495 s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
497 if(s->xvid_build<=12U)
498 s->workaround_bugs|= FF_BUG_EDGE;
500 if(s->xvid_build<=32U)
501 s->workaround_bugs|= FF_BUG_DC_CLIP;
503 #define SET_QPEL_FUNC(postfix1, postfix2) \
504 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
505 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
506 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
508 if(s->lavc_build<4653U)
509 s->workaround_bugs|= FF_BUG_STD_QPEL;
511 if(s->lavc_build<4655U)
512 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
514 if(s->lavc_build<4670U){
515 s->workaround_bugs|= FF_BUG_EDGE;
518 if(s->lavc_build<=4712U)
519 s->workaround_bugs|= FF_BUG_DC_CLIP;
521 if(s->divx_version>=0)
522 s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
523 //printf("padding_bug_score: %d\n", s->padding_bug_score);
524 if(s->divx_version==501 && s->divx_build==20020416)
525 s->padding_bug_score= 256*256*256*64;
527 if(s->divx_version<500U){
528 s->workaround_bugs|= FF_BUG_EDGE;
531 if(s->divx_version>=0)
532 s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
534 if(s->divx_version==500)
535 s->padding_bug_score= 256*256*256*64;
537 /* very ugly XVID padding bug detection FIXME/XXX solve this differently
538 * Let us hope this at least works.
540 if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1
541 && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
542 s->workaround_bugs|= FF_BUG_NO_PADDING;
544 if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok
545 s->workaround_bugs|= FF_BUG_NO_PADDING;
549 if(s->workaround_bugs& FF_BUG_STD_QPEL){
550 SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
551 SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
552 SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
553 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
554 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
555 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
557 SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
558 SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
559 SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
560 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
561 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
562 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
565 if(avctx->debug & FF_DEBUG_BUGS)
566 av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
567 s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
568 s->divx_packed ? "p" : "");
570 #if 0 // dump bits per frame / qp / complexity
573 if(!f) f=fopen("rate_qp_cplx.txt", "w");
574 fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
579 if (s->codec_id == CODEC_ID_MPEG4 && s->xvid_build>=0 && avctx->idct_algo == FF_IDCT_AUTO && (av_get_cpu_flags() & AV_CPU_FLAG_MMX)) {
580 avctx->idct_algo= FF_IDCT_XVIDMMX;
581 avctx->coded_width= 0; // force reinit
582 // dsputil_init(&s->dsp, avctx);
587 /* After H263 & mpeg4 header decode we have the height, width,*/
588 /* and other parameters. So then we could init the picture */
589 /* FIXME: By the way H263 decoder is evolving it should have */
590 /* an H263EncContext */
592 if ( s->width != avctx->coded_width
593 || s->height != avctx->coded_height) {
594 /* H.263 could change picture size any time */
595 ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
596 s->parse_context.buffer=0;
598 s->parse_context= pc;
600 if (!s->context_initialized) {
601 avcodec_set_dimensions(avctx, s->width, s->height);
606 if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P || s->codec_id == CODEC_ID_H263I))
607 s->gob_index = ff_h263_get_gob_height(s);
610 s->current_picture.pict_type= s->pict_type;
611 s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
613 /* skip B-frames if we don't have reference frames */
614 if(s->last_picture_ptr==NULL && (s->pict_type==FF_B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
615 /* skip b frames if we are in a hurry */
616 if(avctx->hurry_up && s->pict_type==FF_B_TYPE) return get_consumed_bytes(s, buf_size);
617 if( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==FF_B_TYPE)
618 || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=FF_I_TYPE)
619 || avctx->skip_frame >= AVDISCARD_ALL)
620 return get_consumed_bytes(s, buf_size);
621 /* skip everything if we are in a hurry>=5 */
622 if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
624 if(s->next_p_frame_damaged){
625 if(s->pict_type==FF_B_TYPE)
626 return get_consumed_bytes(s, buf_size);
628 s->next_p_frame_damaged=0;
631 if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==FF_B_TYPE){
632 s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
633 s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
634 }else if((!s->no_rounding) || s->pict_type==FF_B_TYPE){
635 s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
636 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
638 s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
639 s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
642 if(MPV_frame_start(s, avctx) < 0)
645 if (!s->divx_packed) ff_thread_finish_setup(avctx);
647 if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
648 ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer);
652 if (avctx->hwaccel) {
653 if (avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer) < 0)
657 ff_er_frame_start(s);
659 //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
660 //which is not available before MPV_frame_start()
661 if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
662 ret = ff_wmv2_decode_secondary_picture_header(s);
663 if(ret<0) return ret;
664 if(ret==1) goto intrax8_decoded;
667 /* decode each macroblock */
672 while(s->mb_y<s->mb_height){
673 if(s->msmpeg4_version){
674 if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
677 if(ff_h263_resync(s)<0)
681 if(s->msmpeg4_version<4 && s->h263_pred)
682 ff_mpeg4_clean_buffers(s);
687 if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==FF_I_TYPE)
688 if(!CONFIG_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){
689 s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
692 assert(s->bitstream_buffer_size==0);
694 /* divx 5.01+ bistream reorder stuff */
695 if(s->codec_id==CODEC_ID_MPEG4 && s->divx_packed){
696 int current_pos= get_bits_count(&s->gb)>>3;
697 int startcode_found=0;
699 if(buf_size - current_pos > 5){
701 for(i=current_pos; i<buf_size-3; i++){
702 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
708 if(s->gb.buffer == s->bitstream_buffer && buf_size>7 && s->xvid_build>=0){ //xvid style
715 &s->bitstream_buffer,
716 &s->allocated_bitstream_buffer_size,
717 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
718 if (!s->bitstream_buffer)
719 return AVERROR(ENOMEM);
720 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
721 s->bitstream_buffer_size= buf_size - current_pos;
728 if (avctx->hwaccel) {
729 if (avctx->hwaccel->end_frame(avctx) < 0)
735 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
736 assert(s->current_picture.pict_type == s->pict_type);
737 if (s->pict_type == FF_B_TYPE || s->low_delay) {
738 *pict= *(AVFrame*)s->current_picture_ptr;
739 } else if (s->last_picture_ptr != NULL) {
740 *pict= *(AVFrame*)s->last_picture_ptr;
743 if(s->last_picture_ptr || s->low_delay){
744 *data_size = sizeof(AVFrame);
745 ff_print_debug_info(s, pict);
748 #ifdef PRINT_FRAME_TIME
749 av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
752 return get_consumed_bytes(s, buf_size);
755 AVCodec ff_h263_decoder = {
759 sizeof(MpegEncContext),
763 ff_h263_decode_frame,
764 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
765 .flush= ff_mpeg_flush,
767 .long_name= NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
768 .pix_fmts= ff_hwaccel_pixfmt_list_420,